Department of Livestock Production Management, College of Veterinary and Animal Science, Rajasthan University of Veterinary and Animal Sciences, Bikaner-334001, Rajasthan, India

*Corresponding author

Abstract:

A total of 18 Kankrej cattle of 1st to 4th parity were selected for the study and distributed into three different groups based on their pre calving BCS (before 15 days of expected date of calving) namely G1(2.50 - 3.00), G2 (3.25 - 3.75) and G3 (4.00 and above) with six animals in each group. The average fortnight fat % in G1 was decreased up to 60th day, remained same up to 75th days and thereafter decreased, in G2 group decreased significantly (P<0.05) up to 60th day and again increased up to 90th day, where as in G3 group increased significantly (P<0.05) up to 60th day and then decreased up to 90th day. The average lactose % was 4.40±0.09in G3 group which were highest followed by in G2 and G1 group 4.27±0.009 and 4.19±0.009, respectively. The average TS content of milk changes with advance in lactation in G1 and G2 group animals, and were found to be non significant throughout the study period. The animals of G2 BCS group had shorter postpartum estrus period, a fewer services per conception, higher first service conception rate and a shorter service period followed by Kankrej cattle of G3 group and GI group. The studied revealed that BCS had a significant (P<0.05) effect on the reproductive performance in experimental animals.